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回复 1# STALKER_71

In this case, the reason can not be determined. All the algorithms of EMMC are universal and can not work through ISP. In general, it is reason of the main board.
power on the motherboard, and check the RST_ N of EMMC  Whether RST_N pin is high level, if RST_ N is 0. It is necessary to pull up the pin, otherwise EMMC will not work.

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回复 3# STALKER_71
it maybe  VCCQ Problem .
if this chip not supported by VCCQ=3.3V.  you must use VCCQ=1.8V.
and you need an external  1.8V power.

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回复 6# STALKER_71


   thanks I will test about  these EMMC.

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I got a KMQE60013M-B318
I tested adapter and ISP  .
ALL is Normal.

ADAPTER TEST
KMQE6_B318.jpg
2020-12-24 09:42


ISP TEST
KMQE6_2.jpg
2020-12-24 09:43

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When you build your own circuit and do ISP testing, pay attention to the following points:


1. External power supply voltage must be accurate, using linear regulated power supply.
2. all EMMC GND and VCC  VCCQ must be connected.
3. you can buy EMMC bga221 adapter from dealer.


this is EMMC Pins:

EMMC_221_PIN.jpg
2020-12-24 09:55




this is EMMC bga221 adapter PCB: refer to it

BGA221.rar (575.98 KB)



BOM :
   C1 C2                10uf/10V/1206  
   C3                     2.2uf/10V/1206
   C4/5/6/7/8/9       0.1uf/50V/0603  
   C10                   15P/50V/0603
   R1 R2                33  ohm  /0603
   U4  LDO           XC6206-1.8V

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回复 10# STALKER_71

https://www.aliexpress.com/item/1005001989509124.html

you only use external power VCC=3.3 V on the adapter .  VCCQ and Rstn  not connect then do testing ISP(VCCQ=1.8V)

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